الفهرس 
ProbioticsOnly 14 pages are availabe for public view
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Abstract
Aquaculture is one of the most important industries in the world currently, due to its highly nutritious value and huge profits. Procambarus clarkii Crayfish, is one of the best candidates for aquaculture globally but unfortunately, it does not receive adequate attention in Egypt. This important industry faces many problems, which may ultimately lead to great losses,such as the weakness of the growth of individuals and increasing mortality, in addition to the infection of several bacterial and parasitic diseases. To resolve these topic problems, some people resort to the use of antibiotics with chemical nature and there frequent use may increase resistance of individuals in aquaculture, resulting in negative results, in addition to the harms caused to humans feeding on it. There is now a global trend to replace these topic chemical compounds with other natural ones that increase growth and immunity of individuals in aquaculture and do not cause the damage induced by antibiotics and this issue has been a primary goal of this study.P. clarkii juveniles were used as a model for studying growth performance, survival rates, immunological changes, bioaccumulation of heavy metals and hepatopancreatic changes after six weeks adding of Biogen (probiotic), sodium alginate (prebiotic), Allium sativum and Cynodon dactylon (immunostimulants) as supplementary diet to basal diets.